钢管混凝土系杆拱桥施工过程结构行为非线性分析

针对主跨跨度为２０２ｍ的四川绵阳涪江三桥钢管混凝土系杆拱，考虑结构的非线性和构件的极限承载能力，计入施工过程的变莆和应力的叠加效应，用包含平壳、梁、桁架和索单元在内的空间组合结构模型，进行了大桥的结构行为分析，着重研究了结构在施工过程中的变形，内力和稳定性问题。

Structural Behavior Nonlinear Analysis of Tied Arch Bridge with Concrete-Filled Steel Tubes During Construction

Being aimed at the third bridge over Fu river in the city of Mianyang, Sichuan, a tied arch bridge with concretefilled steel tubes and with a main span of 202 m, a 3dimensional compound structural calculation model constructed by flat shells, beams, trusses and rope elements is used to analyze the structural behavior of the bridge. In the analysis, the structural nonlinearity and ultimate bearing capacity of members are considered, and the deformations during construction and the superposition effect of stresses are also taken into account. The emphasis of the study is focused on the deformations, internal forces and stability of the bridge during construction.